347 stainless steel is variant of the basic austenitic 18/8 Grade 304 with added Columbium – the introduction of Columbium stabilizes the steel and eliminates carbide precipitation which subsequently causes intergranular corrosion.
The steel has excellent forming and welding qualities and excellent toughness even at cryogenic temperatures.
Benefits of 347 Stainless Steel
Higher creep stress and rupture properties when compared with 304
Ideal for high temperature service
Overcomes sensitization and intergranular corrosion concerns
Can be used in elevated temperature applications for ASME Boiler and Pressure Vessel Code applications
Due to stabilisation the material offers better overall corrosion resistance when compared to 304/304L
Excellent mechanical properties
A high carbon version (347H) is also available
Typical Uses
Heat exchangers
High temperature steam service
High temperature chemical process
Both 347H/347 Stainless Steel are used primarily in elevated temperature applications.
Chemical CompositionUNS NoGradeCSiMnPSCrMoNiNOtherS347003470.080.752.000.0450.03017.00/19.00–9.00/13.00–Cb:10xC1.00
Mechanical PropertiesUNS NoGradeProof Stress 0.2% (MPa)Tensile Strength (MPa)Elongation A5(%)Hardness MaxHBHRBS347003472055154020192
Source: wilsonpipeline Pipe Industry (www.wilsonpipeline.com)
Comments